What Should I Do When It Fails to Back Up iPhone WhatsApp Data?
MobileTrans will back up iPhone WhatsApp data to the local drive on your computer. Please make sure there is enough free space on your computer. You'd better clear some data to ensure enough space. It won't back up successfully if no space to save the backup.
Here is another way to back up iPhone data:
Install the latest iTunes
Connect the phone with iTunes and uncheck "Encrypt local backup".
Make sure it completes backup in iTunes.
Run MobileTrans and it will detect the iTunes backup you just made.
You can restore the WhatsApp messages from this backup to other phone.